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Alex Mercer fled to Pennsylvania Station with a vial containing a sample of the Blacklight virus. Mercer was cornered at the station by Blackwatch after having tracked his location from his cellphone. Blackwatch soldiers ordered Mercer to surrender the vial. Mercer refused and, having decided to kill as many as he could, released the virus (that subsequently overran Manhattan) before being killed. Mercer's body fell onto the smashed remains of the vial, in which the Blacklight virus invaded his corpse and rewrote the DNA within every infected cell.